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JEE Main 202430 JanuaryMorning Shift
Exam
JEE Main
Year
2024
Date
30 January
Shift
Morning Shift
Subject
Chemistry
Chapter
Solutions

JEE Main 2024 · 30 January · Morning Shift · Chemistry · Solutions

What happens to freezing point of benzene when small quantity of...

What happens to freezing point of benzene when small quantity of napthalene is added to benzene?  

Options

  1. AIncreases
  2. BRemains unchanged
  3. CFirst decreases and then increases
  4. DDecreases

Correct answer

D. Decreases

Step-by-step solution

Depression in Freezing point can be calculated as,

∆Tf=i×Kf×m∆ {T}_{f} = i \times {K}_{f} \times m

When a non-volatile component is added to the solvent, its freezing point decreases. Here, Napthalene is a non-volatile substance which decreases the freezing point of benzene.

On addition of naphthalene to benzene there is depression in freezing point of benzene.

Hence, the answer is option D.

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